Improve change of identity of a proxy config.
- Add the function linphone_address_equal(). - The comparison of two proxy config addresses now returns one of these three values: equal, weak-equal or different. - If the new proxy config identity is equal to the previous one, a call to linphone_proxy_config_done() does not unregister and does not delete the sal op. If it's weak-equal the sal op is destroyed but the unregister is not done. Finally, if it's different the unregister is performed and the sal op is destroyed.
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